Dr. Amesh Adalja: 'Everything we see looks good' but a long way to go on vaccine

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Dr. Amesh Adalja, a senior scholar at the Johns Hopkins center for health security, joins Andrea Mitchell to discuss how the CDC has been "sidelined" from the data collection process, and positive news on vaccine development, though Dr. Adalja cautions "this is still a long way to getting this into the arms of Americans."